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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '98ea12eef1563fc34ed7a3884ba54198896108baa7c0213df97da4f88cd9106c' 
  AND token = 'G+suDAwlkQ41RC77btJ36FvgJxEcn5o6QLNZTpQekwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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