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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '603fd9709e8c900347d669293d167c07af8a6c35df32da0dd01b17799c3d3756' 
  AND token = 'V+cK1bHiNeZ7qXGBJvoVFB5lYWWcoNNFI4beVeYtKN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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