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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '43e2bd9e714b3e547d4bda6f73e9df04c4f383133be5ed60d35b201ab787f2ca' 
  AND token = 'jrNxINCW3OnVYE8B9kceZSwRXfE85+70pRSL/liOkHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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