SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1a55ea59b96c98e0084491cc80a27f82fa6fd6347d69fd358be0b8bba2e1ad25' 
  AND token = 'YpjUG1d1btQ8ISjlnZaQZp+tgnCzlKUP6PMBoEUyY5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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