SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd6372a9c2ac69950c028f0eb7179134f4316722928b88514ec7e3461f3356fb8' 
  AND token = '+7gFamxJeYMGDhQfIDhNIMrOayqSf6KiYh2X2PYIU9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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