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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4253c73ce45906ce0e0a712300464fa18d3b30fbd5ddd17a99cdc64503677fd7' 
  AND token = 'EVi9aEuQDbpclaGa4bnkH5wPZKyHkD518Pa5HZUMmRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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