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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'febdc5104fd7ee20242676de37e4096c76f93a6d43c2613649070e15f7ad8ebd' 
  AND token = 'icI/xeFx577Eg8YIWnQns42nF+LiSbQ7WJYPSl7d1hI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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