SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c603f938d9ccd9f54437416cef265dd012f37f0287e56337e07b327eb7c83df9' 
  AND token = '2n+JGY+e2zTXoh4Jhgh/B2CZ581q9LlrhlSee1uBmhg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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