SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '63c7094298b5355e2228f6f7c3f956566c891e6ec04dec94a3a1f6c692b56032' 
  AND token = 'VffXCEklcABnflCRpoulZOPwgY9ko7LGFvvsztGrKrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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