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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6c53cb8329f140ac8cb2310ff9a68af9040a772cdc6641aae1efa73bfce590bd' 
  AND token = 'fbbDXPORlYYAgxfEHikUilUY2NaDZwESQGgHHOQmXLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}