SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a8f6c4ce9bcbabbc6751237a8a03ca07b15b380834e0198ef241750ddfbaefc5' 
  AND token = '/rhi9gvFDgB0JDgTAg13GDDJ5svoQWYYbRLBmwXyNg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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