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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ba956497446ef1289eb1e328807b497cc80c7e28c38f744b4535a2f7a08e1c66' 
  AND token = 'PWNaN05iOPdE+qfdnhmVAjBUH/ml+eO05tecoJoQJlo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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