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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'db1feaa91c05497f1b70658065f2c93505c11e8f7f8ee934ee01715e63535ccf' 
  AND token = 'Z0kRXE6T6TpXTLd5DkLEp2B6W8ar9ubLb3V3jTZZdh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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