SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9534398213976932ab7a1a47c02a25f2f081f2ab80cc8db6aaba47f73aa1b1d9' 
  AND token = 'KwAy0boR/ty9zMVTsfI1so8kexhlwwLDBMp+QMmZuPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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