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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fb5b51888e91a66ff3d79569386300cdad6958a81f36ae45f80b5eeb5652ea3b' 
  AND token = 'NLMeiEl8+6pG4N3VrmOCTfUajNGoZQuIapdqDF9ll3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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