SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '731724eaad59fb2a3b4e255bc7f482cd399bf169f9745d4d71a3063ac4560920' 
  AND token = '+rY57zXh1y0CPq/nPvV0EvDPtc36W3Kg2ufyj3J1x8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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