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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8345853020f04088f6e77ce84a6dd0f23add337896cc8ab7299f7391a8043ff0' 
  AND token = 'CNdSz1qK0KEMi8wP6JPzLVUkDS7wpjRI8POxm9HDW0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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