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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6429c32f31d5b7f37ee3ce666dd102813b46c8a023e815efa55a4615d739e6c8' 
  AND token = 'Jg1f9JAAeflzzVhf8tljmZxl53mZ1QSISYOyMsSneT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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