SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b081896b34b30b7837e58df78f4c68393f7bb0810bb5d7a72d778145e7459fc7' 
  AND token = '1xvGf3/UYwy4vQ0gX6w+96zcW+mPCn2nZ8o6e7xgII0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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