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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '805f8e5f2c19466022aea731461eaca387eaa8995bdf662a6cac615bae27e044' 
  AND token = 'SOrslpFReIzKNMi+sggC6n1fKC1f0o9GS/eRjd2o9fM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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