SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '19621adaeb7962a9ffc3c57e3a7db70b2bba953078da61ce9f262c426963cb85' 
  AND token = 'CYi/TB9mHy2jwQiTAj0bC56UDDKGBRhAjT+UcpuSJNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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