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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cf157ebef660521e29a0e04e61cc806ad38ee13fd07f2c4bf643ce52ca62aa0f' 
  AND token = 'ZifjzbUNd0G5Lv5knnm5LlwbScwq493BA+TMhK1riyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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