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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '88f9749c40bda6d975558c162de28b37317dc6eabb9a8d7fcb728e8e34fae1da' 
  AND token = 'K7VSJ6mlC7DjK+7JVo9Tn6LPyt3tYyhlIaEdyAIFSyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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