SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8230d4fc1ee8301a1cced5364966f4528a8f24ff4f55a58de9216cd11357e06d' 
  AND token = 'ogvTbP8eT3qnGjDbFZ7Az6K1Nw4YBQ/IxIv2qC2nG3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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