SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b96861b78d81443a59a80f52c5480feb4c644ab4542c2800a430975b22cf008c' 
  AND token = 'ofsM0sbAzz0fBs/XRuRg6GvtzdVzivWJSZI9PKZ0KZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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