SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a6bb34244be7c97700dee50b4b88f133e316f771c92e1b0183a39e233a42653e' 
  AND token = 'Re+oy11AzqY9glBWBq8JoWcFXGFV1NxzrUC9VQZsi7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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