Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a3a008892831f000ee8163d90a26349adef075350952642cff7c2615101d625a' 
  AND token = 'GdUNUDTSXdPb4ox2XC9PsQHJ8jtjJRuU2vuMiyAbqkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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