SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fb2e16adfd2bc0ba3342fea2843e0dcbc472820f984b2df24a547c1511251ee4' 
  AND token = '0gxG6tZn5KvZROTenhFJQJyBIM3zU+JIGH+pQRYMpoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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