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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bd35d6cb45bad5ee445cbe1b3d84541c88f5f8c9e6e3c76b2460bbfcba39d9e9' 
  AND token = 'nmN4CQz+O8F8SYXa3QYaktR+Y4YEJd7XtSPF9In8OjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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