SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '70c17affe232dc8823b0f4556f975b0b4355086a13ef3fec7c12ffe1c6ddb416' 
  AND token = 'oQiKxUcsV5NIv8amBxlNjsw/YyldZ/W0uyZ3nrgh8pE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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