SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7fd716c6785bcd1b1372cea68f31797849e0fe276eb5d3c77f843ca8c2da52ff' 
  AND token = 'xzqUNV/wZqvKQO7XBvPLImCH8ZYwjif3heAzWsJD1lE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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