SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9fce24aae4a95699f207f12057862290b7dfd321d55dd64ede1b8a79bfb1f25d' 
  AND token = '7H2GVjvuPBg6+K80aHhhRCKA0C/h8zJlZZSHXjwbY1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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