SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '31595b4c9b5b73dbc1b7ad4d99e8d17e24de715dcf8215aa4b027624d70fd621' 
  AND token = 'n/SmU25w5HtX+Q8z54fkVjlQlfdjYaxSjod/EJggqkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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