SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '396fb7cf20506c1dd23ad8bcfd26a81e1555e338b96a348370234e6828313b42' 
  AND token = 'bMF4LeONEyAwfWpXMV+B6TSp5gCwIvn/Q9IfpoHqcCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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