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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9a7a3b880adb0087764d0162a15b8b6ae2ea6c6a283f5c5bc710d9da827ceaf3' 
  AND token = 'ZiJaWM//8NazMh9A6TQX/H9VAWmt8MtQVhQ/8A41o5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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