SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '627e6e623cf7797c1d4e4683dd5bf5e87ac4ae3a9020e5c4c87b57f98f04830a' 
  AND token = 'jRJgOXH+gJTdYhk68liEKEmtq3V1gQHMMuqIajjMT60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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