SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5a50cbbbe001277ae0b8efb46467f99f8d3034db2c27814e43935e8411a3900f' 
  AND token = 'olthIEUH0gEDGay/U0wLXBb9kLOGcYkaYyzKfZhgNWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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