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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8921053e463c1a08bb0c5815e0b3254972ed53eeb4a9a816a7216bd512981199' 
  AND token = '1Gw1yAzLXp2fL8lagDivTHvneMlv+1IN9vpd5WEikO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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