SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7ec5090c0125d3f4fa760a98d745e2c476d95dcc5bc9b295743e9b381d5a1b71' 
  AND token = 'vBc/R4qU6Si8CleVH+lmGjVWrxT+c789Zdlou2V1wJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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