SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3d4540b40d15cca0a1e01ceb319d5081053c28b4e897132ff162a6b6742e3f1a' 
  AND token = 'Oa/OwvnCFs0wzNpQiKPbuzKPBqP1vHk3fd/XykJF28c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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