SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5e7691cee6e2ff8f88765bb8ffdbc85314809356db873c741b5234861a4d6c2b' 
  AND token = 'Q33N+O86QuU/NxORV/56ajKOvgB7yvI0/UwPneYDz+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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