SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '92bf365162334fb835a689c8e7c2cdcdd81bcf84bfb8ec9142897bc24c4314f7' 
  AND token = '+uaBJ8W3+27pZCjE7NaGyTV8d/DMx9xUKzhhNVQnByM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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