SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '656dcc5749daef790f227fbb05262302c7ac845bbf05b2215227740adda681ad' 
  AND token = 'ttuYeXKVOHb9/oXwFoIs+F+f7GPJPPb0BHV0X/4ltpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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