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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '77e371eb5c85f2dc20e392e5c83d13c799f40d3ddbf6ae539da8baa24eb1c8f8' 
  AND token = 'fZfIeHhHEzIwGaFdZpuyGeej68uvdiUwq1FVxG3XCfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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