SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bc6d8b0b6046fb7e9456e349a273de2e6e700add027afe8d1715f3413332c5c5' 
  AND token = 'Q9GNavv5CxsyUyO0ZageB7+qgKX7GnshhjE1PwU5K8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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