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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0a88ac123ba2e13dbd123ed56557055a1fa80f14f93b57afee7235b572dd8c32' 
  AND token = '4BVkdtSY9TjT4bqplH8qyo5+TV3vbS2aXdnGM21NijU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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