SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '973262c31d8a0904ebcca4c2ea4f7c5ec7612a7f34937fd3d62f96f0f8af6854' 
  AND token = '5wveya29gJUFk1Hvo1gHZPz9AXd40TpB+Inpm2PLSSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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