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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '46f79367e87fb6bbb01e87f0e21cc07fb57f58b2fc9ab8c161b13d92bb55bcc0' 
  AND token = 'u0jTwmAWkzVIKBNqVTkriG6ccuXsmjlrJxaKKOeASdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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