SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f1840e00dcafbbc2ff6e8f964740c141a1534318c35cb710de66ddc0358f7997' 
  AND token = 'sxfzeoxaGDbwoSNP/Vl+JU0a3qXJUyKaZ03x+KPxqps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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