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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '410f03ad43eb1c70f2ae467d961cd2463bd90fbba74bdbc85047447d3d3bcc8e' 
  AND token = '38Kn24rcthjdqB9YZ1U8g9MnB5YYmxP/y5Bd0IZcuEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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