SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1ca1f536f9a719f73d7b821e275845c6ced9ccbd557e8182c6ef0fd81cbab281' 
  AND token = 'Lg2/gBAhX5pwLngVEyQOH2rfv66OGIVPv/fs6GzxDYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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