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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fea71e727d49daec631f8a62366ba0de4c265c3f3c548ac205edcc33e3ba7478' 
  AND token = 'jMjwlqYZo2+YaaT2jYwxk8Vbe0z5UiDAWWejTNp2O98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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