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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '35e61e5d4b7f6250ca805f850b0cddb913639e283983f58b893ae33d2151e5ad' 
  AND token = 'ZrC2ippwBWlKlaHtKjd4NQPo+umhONK4eTnaNmt9E8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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