SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '60516d5271afb4241fa85d14a23a433f4243291afc93477402fd4f2cbacf5660' 
  AND token = 'pUHKqVyM6n/+R0zYeCSP7VfL/ejHDkmCI3CPvkqnZtc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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