Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '83c9ab6ee6cdade807eeb6fe3410033632514c39b15cb74ba1a479a28c0ee7a0' 
  AND token = 'QgtMC1fpoVoWtQdQSKhETKmmdc0gnmatjEzhROhXB3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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