SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e671c523ff4368c03dd071ee5313f95468ec7a36b02f6750bbe8f0d7141d22ff' 
  AND token = 'OzKDI1CmYa0m4VlXDtznYaGRV+lSrKnST7BRivb+yKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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