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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '207f380436f5be3e6732853fafd21032c7d60092c31f9f1c5a7f1fa9c59e2f0d' 
  AND token = 'mSE1BpOlC0vDq0cZh1a4psRXe8iTfi5EKcBlfJqUmOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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