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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dffdce1405bcd5e74e4b96fdde5c29e2531b84c939be5a7f4e18b5c2757abaf7' 
  AND token = 'ZIavwkMEaHc9by+NW6zwjL/XlTWfwlvSHF6ztXFKeq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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