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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '17fda27160f49e9ed8ed086356d17ace7e71568575c413d9ef09f03ab1e6d520' 
  AND token = '1dRjXkslKNIYIUOR9ePG5msprukNnLJ8VD5+NUpUvH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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