SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '439de5fa92a88d37e87a05920603fd5d4881a0980ffda434557480a5f2e7ea1c' 
  AND token = 'KyPhcPwzCGy93+45DG0kH+V26QKOZqxjLH9uXNIdmLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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