SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '94e66e5331501b95419df94409252027731f9d910e68851c2132ada6b8cb5fae' 
  AND token = 'dJsFB8ftWvjUTb9s6WKZPyOPehyj0CMtipHzthiVHkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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