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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd72426e1bd5f1f037151e83ae3a47cf4149376eaccd70fc2ea15125504ef7846' 
  AND token = 'v9yxaOTTu7ZKjZxSY0MU3zFe0dLjAjjfPnxUNvZUa/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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