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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1fb3b509775261d577dbd1223a776f228c13d3d17956cf7d078ae70d257ed6fc' 
  AND token = 'B/Pfc8MjVBo7OZmZ7vPohX5ApOkXkllW7bM4MMVxWSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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