SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ed657f3b4988161b297f28ce77e8e22a27362a79f4a678c015ca651513209a15' 
  AND token = 'yXBIh2demVrZ4Q7hojwfmlndHfR2SjMPPKizWgBQIkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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